Trying to diagnose clutch chatter - 1st gear only ??????

[NorCal Cobra]

Please Help!!!!!

My Cobra has gradually developed clutch chatter.

Engine- 427 Stroker motor (2,000 total miles on motor, car, trans, etc...)
Tranny - TKO 600
Clutch - McLeod w/ Willwood slave cylinder setup

The front end of my Cobra chatters and shakes only when I am starting to roll from a dead stop and only in first gear. Once the clutch is disengaged and the vehicle is above 5 MPH, I have no issues and the car work perfectly. It will not chatter in reverse from a dead stop either.

I have been easy on the clutch with little slip and very few hard launches.

The chatter is much worse when going up a steep incline. I have read numerous threads that it may be the Pilot Bushing, warped flywheel, glazed clutch disc, loose motor or tranny mount, and various other possible problems.

The tranny and motor mounts are all tight. I don't belive it is the flywheel or clutch disc, because it only occurs in first gear and I am not receiving any vibration feedback through the clutch pedal.

I am trying to get some input before I decide to pull the entire tranny and clutch.

If you have any possible solutions, please let me know.

Thanks,

Mike